Having Sex Affair With Sister In Law Behind Wife's Back Secretly

I have been married to Betty who was four years older than me for a couple of years. I married her because of her big hanging tits and our sex play. I figured she would eventually along with swinging since since she let me do stuff to her. I should of known she would reject my idea because she wasn't into oral sex. She let me play and slightly abuse her hanging breast also jerked my cock until I cum on them. She knew I enjoyed that but couldn't convince her to blow me. We would do r**e role play and she confessed to me that turns her on. I would screw her hard and really grope her long tits while we played.
She let her sister stay with us until she was settled in our area. Her sister was the same age as me. She has small breasts compared to her older sister who I married but is very pear shape which intrigued me because her hips is very wide with thick legs legs connected there. I began think of doing her and my dream came true.
My boss let me off early one day. I got home and heard the shower going and thought it was my wife showering. I decided to get a daytime roll with my wife. I took my clothes off and stepped in the bathroom naked. To my surprise and embarrassment it was my sister-in-law. She pulled back the shower curtain and said, "Oh, it's you! " I saw she was clean shaven in the kitty area with small tits and flat waist with thick fat thighs which gave me an erection while starring at her. " I can see why my sister married you. Nice ! " She told me to hop in because she wanted to latter my dick my dick and feel how good it is. I watched her groping and rinsing the latter off my dick while tugging it. I groped and felt her small breasts with the urge of squeezing them. They felt so fantastic compared to her sister. I began to flick her nipples making them rigid. She smiled and lowered her head down on my cock licking ad kissing it. I pulled her up and pinned her against the wall while I tongued her nipples and ran my tongue down into her shaven slit. Her slit was a tasty snatch. " You know how eat c**t very well brother-in-law ! "
We went into her room where we sixty -nine each other. I made her get in the doggy position where I held her hips and rammed my cock into her ass crack humping those ass cheeks. "Lick and kiss my ass as you seem to enjoy it very much ! " She told me that her sister married a sex stud and how lucky she is. Then I told her her sister is not into oral or wife swapping. "I wouldn't mind being your secret sex friend and having my sister catch and watch us causing her to divorce you. Then you'll be mine ! "
She turned out to be the gal of my dreams. Her sister divorced me and my ex wife sister and me lived happily together enjoying kinky sex.